Expansion-bolt.



EATENEED EEB. a, 1903. W. O'. BOONE. EXPANSION BOLT, APPLIO-ATION FILED.APB. 18, 1902.

NO MODEL.

WASHING N D (l WILLIAM O. BOONE,

Fries.

ATnNr OF NEW YORK, N. Y.

EXPANSION-BOLT.

SEECIFIGATION forming part of Letters Patent No.

Application filed April 18, 1902.

T0 60M w/Lom/ 25 may concern:

Be it known that I, WILLIAM C. BOONE, a citizen of the United States,and a resident of New York city, borough of Richmond, State of New York,have invented certain new and useful Improvements in Expansion-Bolts, ofwhich the following is a specification.

My invention relates to improvements in what are commonly calledexpansion-bolts and the objects of my invention are to provide improvedmeans for causing the cover portions or outer members of the bolt to eX-pand or separate and for holding the members together when being handledor inserted in a hole.

The invention comprises the novel details of improvement that will bemore fully hereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming parthereof, wherein- Figure lis a side view of an expansion-bolt embodyingmy invention, illustrating what is commonly called a double-expansionbolt. Fig. 2 is a central longitudinal section thereof. Fig. 3 is asimilar view of a single-expansion bolt. Fig. 4 is a perspective view ofthe nut portion of the bolt, and Fig. 5 isa detail of the cover portionof the bolt.

In the accompanying drawings similar numerals of reference indicatecorresponding parts in the several views.

In the accompanying drawings the n umeral l indicates a screw, threadedbolt, or the like. 2 is a nut having internal threads to be engaged bythe threads of said screw or bolt, and 3 4 are covers or expansionmembers of the expansion-bolt.

In Figs. 1 and 2 the device is provided with a collar or sleeve 5,through which the bolt l is adapted to pass freely, providing adoubleexpansion bolt.

One or both ends of the covers or members 3 4 are beveled or taperedoutwardly at 3 4, as clearly shown in Fig. l. When the covers 3 4 areplaced together in position around the bolt l, said covers form a hollowbody provided with a cylindrical bore. The two covers or members 3 4preferably have meeting edges at 6 and are held together around the boltl by an elastic band 7 shown located in annular grooves of said members.

719,426, dated February 3, 1903.

Serial No. 103,518. (No model.)

The nut 2 is wedge-shaped at one endthat is to say, its oppositesurfaces at 2a are inclined or tapered inwardly-forming bearing-surfacesfor the tapered or inclined ends of the covers or members 3 4 to bearupon, and at the inner end the nut 2 has an annular boss or cylindricalportion 2", which its l within the bore of the covers 3 4 and serves las a guide. The outer walls of the boss 2b merge with the inclined orbeveled surfaces 2a of the nut 2, and theinner end ofthe boss 2b is ofsuch diameter Where it meets the inclines 2 as to extend outwardlytherefrom at 2C, forming shoulders or abutments, the inclined orwedge-shaped portions of the nut 2 on the opposite sides at 2(1extending along the boss 2b, as clearly shown in Fig. 4. The covers o1'members 3 4 at one or both ends (according to whether a single-expansionor double-eX- pansion bolt is intended) are provided with internalcentrally-disposed beveled or inclined faces 3b 4", which correspond toand overlie the inclines or bevels 2f of the nut and coincide therewith,as shown in Figs. 2 and 3. The inner ends of the inclined p0rtions 3b 4bproject inwardly from the plane of the wall of the bore of the covers orexpansion members, forming shoulders or abutments adapted to engage theshoulders or abutments 2c on the nut, whereby when the parts areassembled, as in Figs. 2 and 3, the nut is held in position between theends of the covers 3 4 to prevent the nut from becoming detached fromthe covers. The inclined sides 3 4f of the covers or expansion memberscorrespond to the inclines 2d of the nut 2 and bear thereon.

In the double-expansion bolt, as illustrated in Figs. 1 and 2, thecollar 5 is provided with inclines 5 and boss 5b, having shoulders 5C,all substantially as shown with respect to the nut 2 and coacting withthe corresponding inclined portions of the covers 3 4and the shoulders3c 4C in similar manner. In the singleexpansion bolt (shown in Fig. 3)the collar 5 and the correspondingly-shaped ends of the covers 3 4 areomitted.

The parts of the double-expansion bolt be- 2, the bolt ing assembled, asin Figs. l and and the members will all remain united together inhandling and in being passed into When using the bolt, the same is ahole.

IOO

passed into a hole and the threaded member l is rotated, and thereuponwhen the collar 5 meets an abutment the nut 2 and the collar 5 beingdrawn toward each otherl will cause the covers 3 4 to expand, owing tothe sliding of the inclines or wedges of the nut and collar within thecorrespondingly-beveled inner surfaces or edges of the covers, and asthe ends of the covers bear upon the correspondingly-inclined portionsof the nut and collar a firm andrelatively large bearing is provided atthe extreme ends ot' the covers, as well as along the edges 3at 4thereof. With the single-expansion bolt (illustrated in Fig. 3) when thebolt is placed in the hole and the ends of the covers opposite the nut 2bear against an abutment and the screw is rotated the nut 2 will slidebetween the covers, causing them to expand, as before indicated.

Having now described my invention, what I claim isl. Anexpansion-boltcomprising concavoconvex-shaped covers having inclined edges near theirends, and inclined inner faces near their ends between said edgesextending on the plane of said edges and merging therewith, said facesextending inwardly from the inner walls of the covers forming shoulders,a nut having inclined surfaces on opposite sides upon which the inclinedfaces of the covers bear and slide, the nu't being provided withshoulders at the inner ends of its inclined surfaces and a threadedmember to engage the threads of the nut, substantially as described.

2. An expansion-bolt comprising concavecouvex-shaped covers havingoutwardly-inclined inner fiat faces 3l at their ends extending inwardlyof the curved inner surfaces of the covers forming shoulders 3'3 at theinner edges of said faces, a nut having inclined surfaces 2'- onopposite sides to engage the inclined faces 31 of the covers, said nuthaving an annular boss 2b at its inner end extending laterally beyondthe inner edges of the inclined surfaces 2a providing shoulders 2e atsaid inner edges of said inclined surfaces to engage the shoulders 3 onthe covers, the inclines 2dof the nut extending along the boss, saidboss being of a diameter to lit within the bore of the covers to serveas a guide, Iand a threaded member to engage the threads in the nut,substantially as described.

WILLIAM C. BOONE.

vWitnesses:

GEORGE W. LIsK, HERBERT TRUKHAEW.

